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Even in using Motion 4’s Optical flow FCP wasn’t the greatest at slow motion. No more. With the new Final Cut Pro X slow motion is actually usable. Check out this clip of 7D footage slowed to 1%. It does a good job showing what’s under the hood of FCPX.

I have used FCPX retiming and under the retiming options tried all 3 options, Normal, Frame Blending and Optical Flow. In my video Monument Valley (http://youtu.be/ryqdoe6xLs4) I used retiming all over the place and I used Normal with no problem, all shot with 5D at 24fps at 1/50th.

For super slowmo you are right at shooting at 1/500 as I believe that sharper images lend themselves better for Optical Flow, which is what I use in such a case. However, both in FCPS and FCPX it is somehow a crap shoot to whether it really works well or not.

I have contacted the filmmaker of the video above and will update this post as soon as he clarifies his work flow.

Please comment if you yourself learn successful techniques for using optical flow.